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Phys Rev Lett. 2009 May 22;102(20):207401. Epub 2009 May 20.

Beating of exciton-dressed states in a single semiconductor InGaAs/GaAs quantum dot.

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  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, United Kingdom.


We report picosecond control of excitonic dressed states in a single semiconductor quantum dot. A strong laser pulse couples the exciton and biexciton states, to form an Autler-Townes doublet of the neutral exciton transition. The Rabi-splitting, and hence the admixture of the dressed states follows the envelope of the picosecond control laser. We create a superposition of dressed states, and observe the resulting beat: a direct measurement of a Rabi oscillation in time delay rather than the usual power domain.

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